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Twitter @cloecummins, @ColinSanctuary
Contributors According to the definition given by the International Committee of Medical Journal Editors (ICMJE), the authors listed above qualify for authorship based on making one or more of the substantial contributions to the intellectual content of: (i) conception and design (CC and AM); and/or (ii) acquisition of data (CC, JM and CS); and/or (iii) analysis and interpretation of data (CC, JM, CS and AM); and/or (iv) participated in drafting of the manuscript (CC, JM, DK and CS) and/or (v) critical revision of the manuscript for important intellectual content (CC, JM, DK, CS and AM).
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests The National Rugby League provided support in the form of research funding for CC. The National Rugby League did not have any role in the study design, data collection and analysis, decision to publish or preparation of the manuscript. CS holds the position of player development manager at New South Wales Rugby League.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.